78761572 has 6 divisors (see below), whose sum is σ = 137832758. Its totient is φ = 39380784.

The previous prime is 78761521. The next prime is 78761581. The reversal of 78761572 is 27516787.

It can be written as a sum of positive squares in only one way, i.e., 71503936 + 7257636 = 8456^2 + 2694^2 .

It is a super-2 number, since 2×78761572² = 12406770447822368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9845193 + ... + 9845200.

Almost surely, 2^78761572 is an apocalyptic number.

It is an amenable number.

78761572 is a deficient number, since it is larger than the sum of its proper divisors (59071186).

78761572 is a wasteful number, since it uses less digits than its factorization.

78761572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19690397 (or 19690395 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 78761572 is about 8874.7716590344. The cubic root of 78761572 is about 428.6519382928.

The spelling of 78761572 in words is "seventy-eight million, seven hundred sixty-one thousand, five hundred seventy-two".